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Models of policy based routing (RFC1104)

IP.com Disclosure Number: IPCOM000001913D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2019-Feb-11
Document File: 10 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

H.W. Braun: AUTHOR

Related Documents

10.17487/RFC1104: DOI

Abstract

The purpose of this RFC is to outline a variety of models for policy based routing. The relative benefits of the different approaches are reviewed. Discussions and comments are explicitly encouraged to move toward the best policy based routing model that scales well within a large internetworking environment.

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This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group H-W. Braun Request for Comments: 1104 Merit/NSFNET June 1989

Models of Policy Based Routing

1. Status of this Memo

The purpose of this RFC is to outline a variety of models for policy based routing. The relative benefits of the different approaches are reviewed. Discussions and comments are explicitly encouraged to move toward the best policy based routing model that scales well within a large internetworking environment.

Distribution of this memo is unlimited.

2. Acknowledgements

Specific thanks go to Yakov Rekhter (IBM Research), Milo Medin (NASA), Susan Hares (Merit/NSFNET), Jessica Yu (Merit/NSFNET) and Dave Katz (Merit/NSFNET) for extensively contributing to and reviewing this document.

3. Overview

To evaluate the methods and models for policy based routing, it is necessary to investigate the context into which the model is to be used, as there are a variety of different methods to introduce policies. Most frequently the following three models are referenced:

Policy based distribution of routing information Policy based packet filtering/forwarding Policy based dynamic allocation of network resources (e.g., bandwidth, buffers, etc.)

The relative properties of those methods need to be evaluated to find their merits for a specific application. In some cases, more than one method needs to be implemented.

While comparing different models for policy based routing, it is important to realize that specific models have been designed to satisfy a certain set of requirements. For different models these requirements may or may not overlap. Even if they overlap, they may have a different degree of granularity. In the first model, the requirements can be formulated at the Administrative Domain or network number level. In the second model, the requirements can be formulated at the end system level or probably even at the level of

Braun [Page 1]

RFC 1104 Models of Policy Based Routing June 1989

individual users. In the third model, the requirements need to be formulated at both the end system and local router level, as well as at the level of Routing Domains and Administrative Domains.

Each of these models looks at the power of policy based routing in a different way. They may be implemented separately or in combination with other methods. The model to describe policy based dynamic allocation of network resources is orthogonal to the model of policy based distribution of routing information. However, in an actual implementation each of these models may interact.

It is important to realize that the use of a policy based scheme for individual network applications requires that the actual effects as well as the interaction of multiple methods need to be determined ahead of time by policy.

While uncontrolled dynamic routing and allocation of resources may have a better real time behavior, the use of policy based routing will provide a predictable, stable result based on the desires of the administrator. In a production network, it is i...

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